My situation is odd and confusing. I still own a condo in MI where a relative lives and I'm renting down here. TN law says I need to get a TN drivers license within 30 days but I don't know how they would know if I didn't, which I haven't, until I go to renew in Jan. I don't see any reason to surrender my MI license unless I get pulled over between now and then. Livin' on the edge!
I live here and they won't, especially since you have a condo in MI (you are visiting). Don't sweat it at all. East TN isn't hardcore about stuff like that unless you spit on the cop. You will pay sales tax, tag, and title when you buy your car but NO INCOME TAX.
You need to hit The Dragon and Skyway since you are so close.